Unity 2D跑酷游戏Tilemap实例化异常及Grid子对象设置问题

我正在开发一款Unity 2D平台跑酷游戏，已将平台段Tilemap制作成预制体。使用LevelGenerator脚本生成关卡时，Tilemap被压缩到当前网格的单个单元格中；手动将Tilemap放置到Grid下可正常显示。请问如何通过脚本将实例化的Tilemap设置为Grid组件的子对象？

现有代码 #

public class LevelGenerator : MonoBehaviour
{
    private const float PLAYER_GENERATION_DISTANCE = 200f;
    [SerializeField] private Transform StartLevel;
    [SerializeField] private List<Transform> levelPartsList;
    [SerializeField] private GameObject player; 

    private Vector3 lastEndPosition;
    
    
    private void Awake()
    {
        player = GameObject.FindWithTag("Player");
        lastEndPosition = StartLevel.Find("endPosition").position;
    }

    void Update(){
        if (Vector3.Distance(player.transform.position, lastEndPosition) < PLAYER_GENERATION_DISTANCE)
        {
            print("I am WOrking!!!");
            SpawnLevelPart();
        }
    }

    private void SpawnLevelPart()
    {
        Transform selectRandomType = levelPartsList[Random.Range(0,levelPartsList.Count)];
        Transform lastLevelPartTransform = SpawnLevelPart(selectRandomType,lastEndPosition);
        lastEndPosition = lastLevelPartTransform.Find("endPosition").position;
    }

    private Transform SpawnLevelPart(Transform levelPart,Vector3 spawnPosition)
    {
        Transform levelPartTransform = Tilemap.Instantiate(levelPart,spawnPosition,Quaternion.identity);
        return levelPartTransform;

    }
}

效果说明 #

• 异常效果：实例化后的Tilemap被压缩至单个网格单元格内
• 预制体效果：Tilemap布局显示正常

解决方案 #

问题核心是实例化的Tilemap没有挂载到Grid对象下，缺少正确的网格坐标系参考，导致显示异常。按以下步骤修改：

1. 在脚本中添加Grid组件的引用，指定Tilemap的父对象
2. 实例化Tilemap后，设置其transform的父对象为Grid的transform

修改后的完整代码 #

public class LevelGenerator : MonoBehaviour
{
    private const float PLAYER_GENERATION_DISTANCE = 200f;
    [SerializeField] private Transform StartLevel;
    [SerializeField] private List<Transform> levelPartsList;
    [SerializeField] private GameObject player; 
    // 添加Grid引用，在Inspector中拖入场景中的Grid对象
    [SerializeField] private Grid levelGrid;

    private Vector3 lastEndPosition;
    
    
    private void Awake()
    {
        player = GameObject.FindWithTag("Player");
        lastEndPosition = StartLevel.Find("endPosition").position;
    }

    void Update(){
        if (Vector3.Distance(player.transform.position, lastEndPosition) < PLAYER_GENERATION_DISTANCE)
        {
            print("I am WOrking!!!");
            SpawnLevelPart();
        }
    }

    private void SpawnLevelPart()
    {
        Transform selectRandomType = levelPartsList[Random.Range(0,levelPartsList.Count)];
        Transform lastLevelPartTransform = SpawnLevelPart(selectRandomType,lastEndPosition);
        lastEndPosition = lastLevelPartTransform.Find("endPosition").position;
    }

    private Transform SpawnLevelPart(Transform levelPart,Vector3 spawnPosition)
    {
        Transform levelPartTransform = Tilemap.Instantiate(levelPart,spawnPosition,Quaternion.identity);
        // 设置实例化对象的父对象为Grid，保持局部坐标不变避免偏移
        levelPartTransform.SetParent(levelGrid.transform, false);
        return levelPartTransform;
    }
}

关键修改点 #

• 新增[SerializeField] private Grid levelGrid;，在Unity编辑器中将场景中的Grid对象拖入该字段
• 在SpawnLevelPart方法中添加levelPartTransform.SetParent(levelGrid.transform, false);，第二个参数false确保实例化对象的位置不会因父对象变换而偏移

内容的提问来源于stack exchange，提问作者Jbalda